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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2335f65730b4487404b9ce7f6c614bb4d4d0ca77482a42a1f0c94252ca4fb1' 
  AND token = 'IFpbxUb13sZwUI6TxwIDxRnD7XVzbwF0L0QElG7dYW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}